Fix #12699 QDir functions missing from qt.cfg

[chrchr-github]

Co-authored-by: Dominik Strasser unknown@example.com

[firewave]

Having an unknown mail address is probably not good. So maybe we should not use that field.

[danmar]

is this comment wrong it says that QDir::path returns bool?

[danmar]

I suggest <use-retval/>

[dommldomml]

Yes, the comment is a copy-paste error. The failing regressions come from the fact that I fixed the function name of QDir::exists which used to be only "QDir".

[chrchr-github]

Yes, the comment is a copy-paste error. The failing regressions come from the fact that I fixed the function name of QDir::exists which used to be only "QDir".

Do you want to take this over?

[dommldomml]

I can try. What I do not understand is the errors we are seeing. Maybe I have not yet understood the library config.
We now have in qt.cfg:

false

This - according to my understanding - specifies the two functions from the comments as they are like one function with a default parameter.

The regression tests fail with:
Checking /home/runner/work/cppcheck/cppcheck/test/cfg/qt.cpp ...
/home/runner/work/cppcheck/cppcheck/test/cfg/qt.cpp:584:16: information: --check-library: There is no matching configuration for function QFile::exists() [checkLibraryFunction]
if (QFile::exists("test")) {}
^
/home/runner/work/cppcheck/cppcheck/test/cfg/qt.cpp:622:12: information: --check-library: There is no matching configuration for function QFile::exists() [checkLibraryFunction]
QFile::exists("test");
^
/home/runner/work/cppcheck/cppcheck/test/cfg/qt.cpp:625:11: information: --check-library: There is no matching configuration for function QFile::exists() [checkLibraryFunction]
file1.exists();
^
/home/runner/work/cppcheck/cppcheck/test/cfg/qt.cpp:622:0: information: Unmatched suppression: ignoredReturnValue [unmatchedSuppression]
QFile::exists("test");
^
/home/runner/work/cppcheck/cppcheck/test/cfg/qt.cpp:625:0: information: Unmatched suppression: ignoredReturnValue [unmatchedSuppression]
file1.exists();
^

why are the function calls not regarded as matched ? And why is the use-retval ignored ? It is almost as if the whole entry is ignored whereas it seems to have worked before when the entry was bogus as it had

instead of

Ah, now I see it. The regressions are about QFile::exists

[chrchr-github]

I think we now have only QDir::exists() instead of both QFile::exists() and QDir::exists().

[dommldomml]

My bad. I misread it. I'll provide a new qt.cfg + qt.cpp

[chrchr-github]

My bad. I misread it. I'll provide a new qt.cfg + qt.cpp

Please feel free to open your own PR.